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    <title>Document</title>
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<body>
    <div id="app"></div>
    <script src="../src/react.js"></script>
    <script src="../src/react-dom.js"></script>
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    <script type="text/babel">

        class Onec{
            constructor(){
                this.o = 'ooo'
            }
            oo(){
                console.log('oooo');
            }
        }

        class Twoc extends Onec{
            constructor(){
                super()
                this.oc = 'oocc'
            }
            oo(){
                console.log('oocc');
            }
        }
        let oco = new Twoc()
        console.log(oco);
        oco.oo()
       
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        //     element,
        //     document.getElementById("app")
        // )

    </script>
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